My first car in the '70's was a '66 GTO with a '67 Catalina engine from the junkyard with the 061 heads on it. It ran like a scalded cat. I installed a tripower and it was amazing. I junked the heads decades later out of ignorance and now wish I hadn't. They are an oddball, half closed chamber, half open chamber. With my 4 speed and 3.55 gears, they sure ran well. Engine had an 066 cam when I pulled it apart.
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Jeff 
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